/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.metron.parsers.utils;
import java.io.Serializable;

import com.google.code.regexp.Pattern;

public class GrokUtils implements Serializable {

	private static final long serialVersionUID = 7465176887422419286L;
	/**
	   * Extract Grok patter like %{FOO} to FOO, Also Grok pattern with semantic.
	   */
	  public static final Pattern GROK_PATTERN = Pattern.compile(
	      "%\\{" +
	      "(?<name>" +
	        "(?<pattern>[A-z0-9]+)" +
	          "(?::(?<subname>[A-z0-9_:;\\/\\s\\.]+))?" +
	          ")" +
	          "(?:=(?<definition>" +
	            "(?:" +
	            "(?:[^{}]+|\\.+)+" +
	            ")+" +
	            ")" +
	      ")?" +
	      "\\}");

	}
